Pfizer says COVID-19 antiviral pill effective against omicron

Pfizer's COVID-19 treatment pill Paxlovid appears to be effective against the omicron variant, the company announced Tuesday.

Pfizer said three separate lab studies showed nirmatrelvir, the drug's main protease inhibitor, maintains its effectiveness against the omicron variant of the virus. A protease inhibitor is a class of drugs that stop a virus from replicating.